the.com/purifier
a tiny machine fighting the war you can't see in your own lungs
silent enemyindoor air is often dirtier than outside
HEPA origininvented to filter radioactive particles in WWII
size limitcatches particles 300 times thinner than hair
ozone trapsome 'purifiers' actually pollute by emitting ozone
plant rivalsNASA studied houseplants as natural air cleaners